JPS587085B2 - Rotary preset tuner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary preset tuner, and an object of the present invention is to provide a tuner that is small and suitable for use in a vehicle and has good operational reliability.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

In the figure, 1 is a base, 2, 3, 4.5 are support frames attached to the base 1, 6 is a main shaft supported between the support frames 2 and 4, and 7 is fixed to the main shaft 6. drum, 8...
... are threaded rods rotatably installed on the drum 7, each having a gear 9 formed at one end thereof.

10... are memory slugs screwed into the threaded rods 8-..., respectively, and as the threaded rods 8 rotate,
It is configured to be movable only in the axial direction.

Reference numeral 11 denotes a gear body pivotally supported by a sliding holder 12, which will be described later, and a toothed portion 13 formed at one end of the gear body drives a gear 9 of a threaded rod 8 at a predetermined position to move the memory slug 10. It's supposed to be forced.

Reference numeral 14 denotes a slider that is slidably installed by a predetermined distance between the support frames 2 and 3 (see FIG. 3), and is always urged in a fixed direction by a spring (not shown).

15.15 is a guide member fixed to the slider 14, and the memory slug 10 is held between the two members 15.15.

That is, the memory slug 10 positioned at a predetermined position on the threaded rod 8 is successively held by the rotation of the drum 7, and the slider 14 is slid according to the position of the memory slug 10.

A core holding plate 16 is partially engaged with the slider 14, and as the slider 14 slides, a series of cores 17 connected to the core holding plate 16 are connected to the coil 18. . . . It is configured so that it appears inside and tunes in to a desired station.

Here, 5 is a support frame to which a support rod 19 for guiding the movement of the core holding plate 16 is fixed, 20 is a printed circuit board on which necessary electronic components (not shown) are mounted, and the core 17...
. . . together with the coil 18 . . . constitute a so-called front end for AM/FM.

Reference numeral 21 denotes a bushing fixed to the support frame 2 with a nut 22, and inside the bushing 21 is a tuning shaft 2 that is a double shaft.
3 and a manual tuning shaft 24 are mounted.

25 is a bevel gear fixed to the manual tuning shaft 24, and is configured to mesh with the bevel gear 26 of the gear body 11 at all times (when the tuning shaft 23 is not rotating) (see FIG. 1).

27 is a clutch body fitted to the manual tuning shaft 24 so as to be rotatable and slidable in the axial direction, and the clutch body 27 includes:
A bevel gear 29 that can freely mesh with the bevel gear 28 of the main shaft 6
, an annular groove 31, split grooves 32, 32, and a protrusion 33 are formed in one body for locking a protrusion 30 of a sliding holder 12, which will be described later (see FIGS. 5 and 6).

A pin 34 implanted at the end of the tuning shaft 23 is fitted into the slot 32.32, and the pin 34 is fitted into the slot 32.
are connected to the tuning shaft 23 by a so-called spline so that they can rotate as one unit but are slidable in the axial direction.

Here, the above-mentioned pin 34 is formed by integrally molding the pin 34 having a shape as shown in FIG. 7 on the tuning shaft 23, and sufficient consideration has been given to the strength of the pin 23.

Further, the protrusions 33 of the clutch body 27 are arranged in recesses 35 provided at equal intervals on the end surface of the brushing 21.
- It can be freely engaged and disengaged (see Fig. 8), and is normally inserted loosely into the manual tuning shaft 24 between the bevel gear 25 and the clutch body 27 (when the tuning shaft 23 is not rotating). The protrusion 33 is pressed in the direction of the arrow in FIG.
is fitted into one of the recesses 35.

Reference numeral 12 denotes a sliding holder installed on the support frame 2 so as to be able to slide by a predetermined amount (see FIG. 4), and is used to hold the gear body 11
It is pivotally supported by an appropriate means such as a type washer (not shown), and its protrusion 30 is engaged with an annular groove 31 of the clutch body 27, so that as the clutch body 27 moves in the axial direction, it slides. The dynamic holder 12 also moves together with the clutch body 27 using its bending guide piece 36 as a guide to the support frame 2.

As is clear from the above structure, when the tuning shaft 23 is rotated from the state shown in the first figure, the crunch body 27 engaged with the pin 34 of the tuning shaft 23 also rotates, and the protrusion 3 of the clutch body 27 is rotated.
3 is removed from the recess 35 of the pushing 21, and the clutch body 27 is moved in the direction of the arrow in FIG. 9 against the elasticity of the coil spring 36.

As the clutch body 27 moves, the sliding holding body 12 also moves in the same direction, separating the gear body 11 from the bevel gear 25 of the manual tuning shaft 24 and the gear 9 of the threaded rod 8, and then the clutch body The bevel teeth 27 of 27 mesh with the bevel gear 28 of the main shaft 6.

The subsequent rotation of the tuning shaft 23 causes the bevel gear 27.
28 to the drum 7 which rotates as one body with the main shaft 6,
As described above, the memory slug 10 on the threaded rod 8 is fitted into the guide members 15, 15 of the slider 14, and the core 17 connected to the core holding plate 16 is slid by a predetermined amount via the slider 14, thereby setting the desired station. Select a station.

Then, at this desired station selection position, that is, at the position where the memory slug 10 is held between the guide members 15, 15 of the slider 14, the protrusion 33 of the clutch body 27 is fitted into the next recess 35 of the bushing 21. The rotation angle transmission ratio between the bevel gear 28 and the bevel gear 29 is set, and the protrusion 33 of the clutch body 27, the recess 35 of the bushing 21, and the coil spring 36 constitute a so-called moderation mechanism, and the tuning axis It is configured to give a moderation (click feel) to the rotation of the drum 23 (in some cases, a separate moderation mechanism may be provided on the drum 7 side).

Furthermore, at this desired tuning position, as described above, the protrusion 33 of the clutch body 27 is fitted into the recess 35 of the bushing 21, so the bevel gear 29 of the clutch body 27 and the bevel gear 28 of the main shaft 6 are The state has returned to the state shown in the first diagram in which the mesh is disengaged.

Also, when performing preset adjustment (or manual tuning in some cases), by rotating the manual tuning shaft 24, the bevel gear 25 of the manual tuning shaft 24 and the gear body 1
Since the bevel gear 26 of 1, the tooth portion 13 of the gear body 11, and the gear 9 of the threaded rod 8 are normally in a meshing state (when the tuning shaft 23 is not rotating), the rotation of the manual tuning shaft 24 is caused by the rotation of the gear. body 1
1 to the threaded rod 8, and the slider 14
The memory slug 10 on the threaded rod 8, which is held between both guide members 15 and 15, is moved.

Then, when the memory slug 10 moves, the slider 14 slides as described above, causing the core 17 to move in and out of the coil 18, thereby obtaining the optimum reception state for the desired station, and in this state, the memory slug 10 positions are determined.

As mentioned above, the present invention has a configuration in which a preset station is selected by rotating the tuning axis having a dual axis structure, or preset adjustment or manual tuning is performed by rotating the other manual tuning axis. The operating mechanism is compact and has good operability.

In addition, when the tuning shaft rotates, the gear coupling of the manual tuning system is released, and when the manual tuning shaft rotates, the gear coupling of the detent tuning system is released, so there is no risk that both operation transmission systems will operate at the same time. The operation reliability is high, and even if both the tuning axis and the manual tuning axis are rotated at the same time due to an erroneous operation during detent tuning, the gears of the manual tuning system are disengaged, so the gears will be in the correct position beforehand. There is no fear of disturbing the adjusted preset position.

Overall, the operability and operational reliability are good, and rotary preset tuners are smaller than conventional push-button tuners for vehicles, so they are required to be compact and easy to operate. However, it has great practical utility when applied to car-mounted radio receivers where it is difficult to pay close attention to tuning operations.

[Brief explanation of the drawing]

The drawings all relate to a rotary preset tuner according to an embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is a front view, Fig. 3 is an explanatory view showing a slider, and Fig. 4 is a sliding holding. FIG. 5 is a sectional view of essential parts showing related members to the clutch body, FIG. 6 is a perspective view of the clutch body, and FIG. 7 is a perspective view showing the clutch body.
FIG. 8 is an explanatory view showing the pin, FIG. 8 is an explanatory view showing the concave portion of the bushing, and FIG. 9 is a plan view of the main part showing when the tuning shaft is rotated. 1... Base, 2, 3, 4.5... Support frame, 6... Main shaft, γ... Drum, 8...
...Threaded rod, 9...Gear, 10...
...Memory slug, 11...Gear body, 12.
...Sliding holding body, 14...Slider,
16... Core holding plate, 17... Core,
18... Coil, 21... Bushing, 23... Tuning axis, 24... Manual tuning axis, 25, 26... Umbrella Gear, 27...
...Clutch body, 28.29...Bevel gear,
31 Annular groove of clutch body 27, 32... Division groove of clutch body 27, 33... Protrusion of clutch body 27, 34... Pin of tuning shaft 23, 35 ...
...Concavity of pushing 21.

Claims (1)

[Claims] 1. In a configuration in which a preset station is selected by rotating a tuning axis, and preset adjustment or manual tuning is performed by rotating a manual tuning axis, the tuning axis and the manual tuning axis are mutually rotatable. The rotary type is characterized in that when the tuning shaft rotates, the gear coupling of the manual tuning system is released, and when the manual tuning shaft rotates, the gear coupling of the detent tuning system is released. Preset tuner.